title: Comparison of multiple red cell volume methods performed concurrently in premature infants following allogeneic transfusion.
abstract: BACKGROUND
  Study of the pathophysiology and treatment of anemia of prematurity is facilitated by direct measurement of red cell volume (RCV) utilizing microliter quantities of blood samples. Our objective was to compare concurrent measurements of multiple direct RCV methods in infants.
  
  
  METHODS
  Eighteen preterm infants receiving clinically indicated transfusions had concurrent flow cytometric determinations of RCV and 24-h red blood cell (RBC) recovery based on donor-recipient differences of biotin-labeled RBCs (BioRBCs), Kidd antigen mismatched RBCs, and fetal hemoglobin-positive (HbF(+)) RBCs. High-performance liquid chromatography (HPLC) was also used for measuring HbF and adult hemoglobin protein concentrations for the determination of RCV.
  
  
  RESULTS
  Concurrent RCV measurements using BioRBCs (18 and 54 µg/ml), Kidd antigen, and HbF flow cytometry were not statistically different compared with RCVs measured using the reference BioRBC density (6 µg/ml). By contrast, the HbF-HPLC method overestimated RCV by 45% compared with the reference method. All the methods demonstrated 100% 24-h posttransfusion RBC recovery (PTR24).
  
  
  CONCLUSIONS
  Because BioRBC, Kidd antigen, and fetal hemoglobin (HbF) flow cytometry are safe and accurate methods requiring <10 µl of patient blood for determining RCV and PTR24 in preterm infants, they can be useful in clinical and research studies of anemia and other conditions.
authors.affiliation: Department of Pediatrics, University of Iowa, Iowa City, Iowa.
authors.forename: Demet
authors.initials: D
authors.lastname: Nalbant
authors.forename: Prasad
authors.initials: P
authors.lastname: Bhandary
authors.forename: Nell I
authors.initials: NI
authors.lastname: Matthews
authors.forename: Robert L
authors.initials: RL
authors.lastname: Schmidt
authors.forename: Anna
authors.initials: A
authors.lastname: Bogusiewicz
authors.forename: Gretchen A
authors.initials: GA
authors.lastname: Cress
authors.forename: M Bridget
authors.initials: MB
authors.lastname: Zimmerman
authors.forename: Ronald G
authors.initials: RG
authors.lastname: Strauss
authors.forename: Donald M
authors.initials: DM
authors.lastname: Mock
authors.forename: John A
authors.initials: JA
authors.lastname: Widness
mesh_terms: D000740:Anemia / Q000628:therapy*; D001803:Blood Transfusion / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004911:Erythrocyte Volume; D005319:Fetal Hemoglobin / Q000378:metabolism; D005434:Flow Cytometry / Q000379:methods*; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature / Q000097:blood*; D019102:Infant, Very Low Birth Weight / Q000097:blood*; D007667:Kidd Blood-Group System / Q000032:analysis; D012044:Regression Analysis
chemical_list: D007667:Kidd Blood-Group System; D005319:Fetal Hemoglobin